Total Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Total Debt Outstanding

The following table presents our total debt outstanding:

	As of December 31, 2017
			Unamortized Premium, Debt Issuance Costs and Loan Origination Fees
(in millions)	Outstanding Principal		Premium		Issuance Costs and Fees		Long-Term Debt, Net
2017 Credit Agreement:
Term Loan B due 2024	$	400.0	$	—	$	5.1	$	394.9
Revolving Credit Facility	239.0		—		—		239.0
Swing line of credit	3.0		—		—		3.0
Total 2017 Credit Agreement	642.0		—		5.1		636.9
2028 Senior Notes	500.0		—		7.7		492.3
Total debt	1,142.0		—		12.8		1,129.2
Current maturities of long-term debt	4.0		—		—		4.0
Total debt, net of current maturities	$	1,138.0	$	—	$	12.8	$	1,125.2

	As of December 31, 2016
			Unamortized Premium, Debt Issuance Costs and Loan Origination Fees
(in millions)	Outstanding Principal		Premium		Issuance Costs and Fees		Long-Term Debt, Net
2014 Credit Agreement:
Senior Secured Credit Facility due 2021	$	135.0	$	—	$	—	$	135.0
Term Loan A due 2021	179.3		—		0.5		178.8
Swing line of credit	13.2		—		—		13.2
Total 2014 Credit Agreement	327.5		—		0.5		327.0
2021 Senior Notes	600.0		2.5		7.8		594.7
Total debt	927.5		2.5		8.3		921.7
Current maturities of long-term debt	14.2		—		—		14.2
Total debt, net of current maturities	$	913.3	$	2.5	$	8.3	$	907.5

Schedule of Future Aggregate Maturities of Total Debt

Future aggregate maturities of total debt are as follows (in millions):

Years Ended December 31,
2018	$	4.0
2019	4.0
2020	4.0
2021	4.0
2022	246.0
Thereafter	880.0
Total	$	1,142.0